BFK may refer to Battelle for Kids, a not-for-profit organization BFK (song), by rapper Freddie Gibbs BFK (Swiss Air Force), short for Berufsfliegerkorps BFK (British Rail coach designation) BFK
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0aa846a941ae4379e0b33f48a81b09067ce78b37962769759bffa7705a7a36c. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9555e542-62aa-4569-8be9-c9b765523d0e.json and https://artists.proofprofile.net/proofs/artist/9555e542-62aa-4569-8be9-c9b765523d0e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Believer (Karaoke Version Originally performed by Imagine Dragons)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33eebc3bfa6db80f8b559f062dc4202e76e6fa4bf0039ac9665175cb0070f57c. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:07:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBHJQ1899009.